I don't think it's so much that you can't TALK to him at all, as it is you need to:
- not initiate the talks
- not engage in R talks, even if HE initiates. DON'T DO IT!!
- not be so responsive when he texts or calls you; be UNAVAILABLE more often;
- DON'T MEET ANY OF HIS EMOTIONAL NEEDS IN THE CONVOS
You can be civil; even cordial. Be what a decent friend or roommate would be. But don't be what a WIFE should be, or even what a BEST friend would be. Because as long as he's getting those emotional needs filled by you, and some others filled by OW, he will continue to waffle back and forth between both pieces of cake.
At least, that's what worked for me. It was my FRIENDSHIP that my wife said she missed the most.
